Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c9de5781d18cea…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 09:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d25bc8c9e5a4fe5b0ba6a53c8cec6854 SHA-1: 117d12317ea7406f6ab90f82f4ab09e6bddf0c72 SHA-256: 06c9de5781d18ceac468039785b7f08998c4851dbba7fb635b89558cef963f7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to potentially compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to direct users to external, untrusted resources, likely for phishing or malicious content delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://defaico.com/d/files/73318919695.pdf In PDF document text
    • http://irk-yoga.ru/upload/files/55010566329.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/50718240072.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/fonolusozajikubuxerala.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/jelususedop.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/poxubad.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/35084336001.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/podisodozurotulenexiz.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/wawalawuniweveve.pdfIn PDF document text
    • http://newcastlehigh1967-50threunion.com/clients/43248/File/58296186525.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/sekagakib.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21221216027.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/50095651310.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e29be09dec---ligeramawobokeluperar.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6c61b119f---jirizerowiso.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/judate.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/65167211822.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/70961662247.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/vajawebizepinazugozafo.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/96936441107.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/tekivokuse.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b7d8a44d709959b30caed3f6bce60062/wipufexanakotineko.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/wolaturikaboziwawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=practice+subnetting+questions+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 17276 bytes
SHA-256: 8ebd7bee6e2d959315597899eaf7dea907fe6cf85a774a3aa6a080fbde598b09
font_01_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 11136 bytes
SHA-256: 0435d3f1642508cba3946e419fb7e4e347956e2ce106b0855e009823dedfa334